Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
Nathan Scott | 7b71876 | 2005-11-02 14:58:39 +1100 | [diff] [blame] | 2 | * Copyright (c) 2000-2005 Silicon Graphics, Inc. |
| 3 | * All Rights Reserved. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4 | * |
Nathan Scott | 7b71876 | 2005-11-02 14:58:39 +1100 | [diff] [blame] | 5 | * This program is free software; you can redistribute it and/or |
| 6 | * modify it under the terms of the GNU General Public License as |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 7 | * published by the Free Software Foundation. |
| 8 | * |
Nathan Scott | 7b71876 | 2005-11-02 14:58:39 +1100 | [diff] [blame] | 9 | * This program is distributed in the hope that it would be useful, |
| 10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 12 | * GNU General Public License for more details. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 13 | * |
Nathan Scott | 7b71876 | 2005-11-02 14:58:39 +1100 | [diff] [blame] | 14 | * You should have received a copy of the GNU General Public License |
| 15 | * along with this program; if not, write the Free Software Foundation, |
| 16 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 17 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 18 | #ifndef __XFS_BUF_H__ |
| 19 | #define __XFS_BUF_H__ |
| 20 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 21 | #include <linux/list.h> |
| 22 | #include <linux/types.h> |
| 23 | #include <linux/spinlock.h> |
| 24 | #include <asm/system.h> |
| 25 | #include <linux/mm.h> |
| 26 | #include <linux/fs.h> |
| 27 | #include <linux/buffer_head.h> |
| 28 | #include <linux/uio.h> |
| 29 | |
| 30 | /* |
| 31 | * Base types |
| 32 | */ |
| 33 | |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 34 | #define XFS_BUF_DADDR_NULL ((xfs_daddr_t) (-1LL)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 35 | |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 36 | #define xfs_buf_ctob(pp) ((pp) * PAGE_CACHE_SIZE) |
| 37 | #define xfs_buf_btoc(dd) (((dd) + PAGE_CACHE_SIZE-1) >> PAGE_CACHE_SHIFT) |
| 38 | #define xfs_buf_btoct(dd) ((dd) >> PAGE_CACHE_SHIFT) |
| 39 | #define xfs_buf_poff(aa) ((aa) & ~PAGE_CACHE_MASK) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 40 | |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 41 | typedef enum { |
| 42 | XBRW_READ = 1, /* transfer into target memory */ |
| 43 | XBRW_WRITE = 2, /* transfer from target memory */ |
| 44 | XBRW_ZERO = 3, /* Zero target memory */ |
| 45 | } xfs_buf_rw_t; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 46 | |
Christoph Hellwig | 807cbbd | 2010-06-24 11:49:12 +1000 | [diff] [blame] | 47 | #define XBF_READ (1 << 0) /* buffer intended for reading from device */ |
| 48 | #define XBF_WRITE (1 << 1) /* buffer intended for writing to device */ |
Christoph Hellwig | 1d5ae5d | 2011-07-08 14:36:32 +0200 | [diff] [blame] | 49 | #define XBF_READ_AHEAD (1 << 2) /* asynchronous read-ahead */ |
| 50 | #define XBF_MAPPED (1 << 3) /* buffer mapped (b_addr valid) */ |
Christoph Hellwig | 807cbbd | 2010-06-24 11:49:12 +1000 | [diff] [blame] | 51 | #define XBF_ASYNC (1 << 4) /* initiator will not wait for completion */ |
| 52 | #define XBF_DONE (1 << 5) /* all pages in the buffer uptodate */ |
| 53 | #define XBF_DELWRI (1 << 6) /* buffer has dirty pages */ |
| 54 | #define XBF_STALE (1 << 7) /* buffer has been staled, do not find it */ |
Christoph Hellwig | 1d5ae5d | 2011-07-08 14:36:32 +0200 | [diff] [blame] | 55 | |
| 56 | /* I/O hints for the BIO layer */ |
| 57 | #define XBF_SYNCIO (1 << 10)/* treat this buffer as synchronous I/O */ |
| 58 | #define XBF_FUA (1 << 11)/* force cache write through mode */ |
| 59 | #define XBF_FLUSH (1 << 12)/* flush the disk cache before a write */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 60 | |
Christoph Hellwig | 807cbbd | 2010-06-24 11:49:12 +1000 | [diff] [blame] | 61 | /* flags used only as arguments to access routines */ |
Christoph Hellwig | 1d5ae5d | 2011-07-08 14:36:32 +0200 | [diff] [blame] | 62 | #define XBF_LOCK (1 << 15)/* lock requested */ |
| 63 | #define XBF_TRYLOCK (1 << 16)/* lock requested, but do not wait */ |
| 64 | #define XBF_DONT_BLOCK (1 << 17)/* do not block in current thread */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 65 | |
Christoph Hellwig | 807cbbd | 2010-06-24 11:49:12 +1000 | [diff] [blame] | 66 | /* flags used only internally */ |
Christoph Hellwig | 1d5ae5d | 2011-07-08 14:36:32 +0200 | [diff] [blame] | 67 | #define _XBF_PAGES (1 << 20)/* backed by refcounted pages */ |
| 68 | #define _XBF_KMEM (1 << 21)/* backed by heap memory */ |
| 69 | #define _XBF_DELWRI_Q (1 << 22)/* buffer on delwri queue */ |
Christoph Hellwig | 6ab455e | 2008-05-19 16:34:42 +1000 | [diff] [blame] | 70 | |
Christoph Hellwig | 807cbbd | 2010-06-24 11:49:12 +1000 | [diff] [blame] | 71 | typedef unsigned int xfs_buf_flags_t; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 72 | |
Christoph Hellwig | 0b1b213 | 2009-12-14 23:14:59 +0000 | [diff] [blame] | 73 | #define XFS_BUF_FLAGS \ |
| 74 | { XBF_READ, "READ" }, \ |
| 75 | { XBF_WRITE, "WRITE" }, \ |
Christoph Hellwig | 1d5ae5d | 2011-07-08 14:36:32 +0200 | [diff] [blame] | 76 | { XBF_READ_AHEAD, "READ_AHEAD" }, \ |
Christoph Hellwig | 0b1b213 | 2009-12-14 23:14:59 +0000 | [diff] [blame] | 77 | { XBF_MAPPED, "MAPPED" }, \ |
| 78 | { XBF_ASYNC, "ASYNC" }, \ |
| 79 | { XBF_DONE, "DONE" }, \ |
| 80 | { XBF_DELWRI, "DELWRI" }, \ |
| 81 | { XBF_STALE, "STALE" }, \ |
Christoph Hellwig | 1d5ae5d | 2011-07-08 14:36:32 +0200 | [diff] [blame] | 82 | { XBF_SYNCIO, "SYNCIO" }, \ |
| 83 | { XBF_FUA, "FUA" }, \ |
| 84 | { XBF_FLUSH, "FLUSH" }, \ |
Christoph Hellwig | 0b1b213 | 2009-12-14 23:14:59 +0000 | [diff] [blame] | 85 | { XBF_LOCK, "LOCK" }, /* should never be set */\ |
| 86 | { XBF_TRYLOCK, "TRYLOCK" }, /* ditto */\ |
| 87 | { XBF_DONT_BLOCK, "DONT_BLOCK" }, /* ditto */\ |
Christoph Hellwig | 0b1b213 | 2009-12-14 23:14:59 +0000 | [diff] [blame] | 88 | { _XBF_PAGES, "PAGES" }, \ |
Dave Chinner | 0e6e847 | 2011-03-26 09:16:45 +1100 | [diff] [blame] | 89 | { _XBF_KMEM, "KMEM" }, \ |
| 90 | { _XBF_DELWRI_Q, "DELWRI_Q" } |
Christoph Hellwig | 0b1b213 | 2009-12-14 23:14:59 +0000 | [diff] [blame] | 91 | |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 92 | typedef enum { |
Eric Sandeen | 687d1c5 | 2011-12-13 23:12:45 +0000 | [diff] [blame] | 93 | XBT_FORCE_FLUSH = 0, |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 94 | } xfs_buftarg_flags_t; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 95 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 96 | typedef struct xfs_buftarg { |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 97 | dev_t bt_dev; |
| 98 | struct block_device *bt_bdev; |
Dave Chinner | 0e6e847 | 2011-03-26 09:16:45 +1100 | [diff] [blame] | 99 | struct backing_dev_info *bt_bdi; |
Dave Chinner | ebad861 | 2010-09-22 10:47:20 +1000 | [diff] [blame] | 100 | struct xfs_mount *bt_mount; |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 101 | unsigned int bt_bsize; |
| 102 | unsigned int bt_sshift; |
| 103 | size_t bt_smask; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 104 | |
David Chinner | a6867a6 | 2006-01-11 15:37:58 +1100 | [diff] [blame] | 105 | /* per device delwri queue */ |
| 106 | struct task_struct *bt_task; |
Christoph Hellwig | c4e1c09 | 2011-08-23 08:28:08 +0000 | [diff] [blame] | 107 | struct list_head bt_delwri_queue; |
| 108 | spinlock_t bt_delwri_lock; |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 109 | unsigned long bt_flags; |
Dave Chinner | ff57ab2 | 2010-11-30 17:27:57 +1100 | [diff] [blame] | 110 | |
| 111 | /* LRU control structures */ |
| 112 | struct shrinker bt_shrinker; |
Dave Chinner | 430cbeb | 2010-12-02 16:30:55 +1100 | [diff] [blame] | 113 | struct list_head bt_lru; |
| 114 | spinlock_t bt_lru_lock; |
| 115 | unsigned int bt_lru_nr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 116 | } xfs_buftarg_t; |
| 117 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 118 | struct xfs_buf; |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 119 | typedef void (*xfs_buf_iodone_t)(struct xfs_buf *); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 120 | |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 121 | #define XB_PAGES 2 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 122 | |
| 123 | typedef struct xfs_buf { |
Dave Chinner | 50f59e8 | 2010-09-24 19:59:15 +1000 | [diff] [blame] | 124 | /* |
| 125 | * first cacheline holds all the fields needed for an uncontended cache |
| 126 | * hit to be fully processed. The semaphore straddles the cacheline |
| 127 | * boundary, but the counter and lock sits on the first cacheline, |
| 128 | * which is the only bit that is touched if we hit the semaphore |
| 129 | * fast-path on locking. |
| 130 | */ |
Dave Chinner | 74f75a0 | 2010-09-24 19:59:04 +1000 | [diff] [blame] | 131 | struct rb_node b_rbnode; /* rbtree node */ |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 132 | xfs_off_t b_file_offset; /* offset in file */ |
| 133 | size_t b_buffer_length;/* size of buffer in bytes */ |
Dave Chinner | 50f59e8 | 2010-09-24 19:59:15 +1000 | [diff] [blame] | 134 | atomic_t b_hold; /* reference count */ |
Dave Chinner | 430cbeb | 2010-12-02 16:30:55 +1100 | [diff] [blame] | 135 | atomic_t b_lru_ref; /* lru reclaim ref count */ |
Dave Chinner | 50f59e8 | 2010-09-24 19:59:15 +1000 | [diff] [blame] | 136 | xfs_buf_flags_t b_flags; /* status flags */ |
| 137 | struct semaphore b_sema; /* semaphore for lockables */ |
| 138 | |
Dave Chinner | 430cbeb | 2010-12-02 16:30:55 +1100 | [diff] [blame] | 139 | struct list_head b_lru; /* lru list */ |
Dave Chinner | 50f59e8 | 2010-09-24 19:59:15 +1000 | [diff] [blame] | 140 | wait_queue_head_t b_waiters; /* unpin waiters */ |
| 141 | struct list_head b_list; |
| 142 | struct xfs_perag *b_pag; /* contains rbtree root */ |
| 143 | xfs_buftarg_t *b_target; /* buffer target (device) */ |
| 144 | xfs_daddr_t b_bn; /* block number for I/O */ |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 145 | size_t b_count_desired;/* desired transfer size */ |
| 146 | void *b_addr; /* virtual address of buffer */ |
| 147 | struct work_struct b_iodone_work; |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 148 | xfs_buf_iodone_t b_iodone; /* I/O completion function */ |
David Chinner | b4dd330 | 2008-08-13 16:36:11 +1000 | [diff] [blame] | 149 | struct completion b_iowait; /* queue for I/O waiters */ |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 150 | void *b_fspriv; |
Christoph Hellwig | bf9d901 | 2011-07-13 13:43:49 +0200 | [diff] [blame] | 151 | struct xfs_trans *b_transp; |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 152 | struct page **b_pages; /* array of page pointers */ |
| 153 | struct page *b_page_array[XB_PAGES]; /* inline pages */ |
Dave Chinner | 50f59e8 | 2010-09-24 19:59:15 +1000 | [diff] [blame] | 154 | unsigned long b_queuetime; /* time buffer was queued */ |
| 155 | atomic_t b_pin_count; /* pin count */ |
| 156 | atomic_t b_io_remaining; /* #outstanding I/O requests */ |
| 157 | unsigned int b_page_count; /* size of page array */ |
| 158 | unsigned int b_offset; /* page offset in first page */ |
| 159 | unsigned short b_error; /* error code on I/O */ |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 160 | #ifdef XFS_BUF_LOCK_TRACKING |
| 161 | int b_last_holder; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 162 | #endif |
| 163 | } xfs_buf_t; |
| 164 | |
| 165 | |
| 166 | /* Finding and Reading Buffers */ |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 167 | extern xfs_buf_t *_xfs_buf_find(xfs_buftarg_t *, xfs_off_t, size_t, |
| 168 | xfs_buf_flags_t, xfs_buf_t *); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 169 | #define xfs_incore(buftarg,blkno,len,lockit) \ |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 170 | _xfs_buf_find(buftarg, blkno ,len, lockit, NULL) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 171 | |
Christoph Hellwig | 6ad112b | 2009-11-24 18:02:23 +0000 | [diff] [blame] | 172 | extern xfs_buf_t *xfs_buf_get(xfs_buftarg_t *, xfs_off_t, size_t, |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 173 | xfs_buf_flags_t); |
Christoph Hellwig | 6ad112b | 2009-11-24 18:02:23 +0000 | [diff] [blame] | 174 | extern xfs_buf_t *xfs_buf_read(xfs_buftarg_t *, xfs_off_t, size_t, |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 175 | xfs_buf_flags_t); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 176 | |
Christoph Hellwig | 4347b9d | 2011-10-10 16:52:48 +0000 | [diff] [blame] | 177 | struct xfs_buf *xfs_buf_alloc(struct xfs_buftarg *, xfs_off_t, size_t, |
| 178 | xfs_buf_flags_t); |
Dave Chinner | 4439647 | 2011-04-21 09:34:27 +0000 | [diff] [blame] | 179 | extern void xfs_buf_set_empty(struct xfs_buf *bp, size_t len); |
Dave Chinner | 686865f | 2010-09-24 20:07:47 +1000 | [diff] [blame] | 180 | extern xfs_buf_t *xfs_buf_get_uncached(struct xfs_buftarg *, size_t, int); |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 181 | extern int xfs_buf_associate_memory(xfs_buf_t *, void *, size_t); |
| 182 | extern void xfs_buf_hold(xfs_buf_t *); |
Christoph Hellwig | 1a1a3e9 | 2010-10-06 18:41:18 +0000 | [diff] [blame] | 183 | extern void xfs_buf_readahead(xfs_buftarg_t *, xfs_off_t, size_t); |
Dave Chinner | 5adc94c | 2010-09-24 21:58:31 +1000 | [diff] [blame] | 184 | struct xfs_buf *xfs_buf_read_uncached(struct xfs_mount *mp, |
| 185 | struct xfs_buftarg *target, |
| 186 | xfs_daddr_t daddr, size_t length, int flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 187 | |
| 188 | /* Releasing Buffers */ |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 189 | extern void xfs_buf_free(xfs_buf_t *); |
| 190 | extern void xfs_buf_rele(xfs_buf_t *); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 191 | |
| 192 | /* Locking and Unlocking Buffers */ |
Christoph Hellwig | 0c842ad | 2011-07-08 14:36:19 +0200 | [diff] [blame] | 193 | extern int xfs_buf_trylock(xfs_buf_t *); |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 194 | extern void xfs_buf_lock(xfs_buf_t *); |
| 195 | extern void xfs_buf_unlock(xfs_buf_t *); |
Christoph Hellwig | 0c842ad | 2011-07-08 14:36:19 +0200 | [diff] [blame] | 196 | #define xfs_buf_islocked(bp) \ |
| 197 | ((bp)->b_sema.count <= 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 198 | |
| 199 | /* Buffer Read and Write Routines */ |
Christoph Hellwig | c2b006c | 2011-08-23 08:28:07 +0000 | [diff] [blame] | 200 | extern int xfs_bwrite(struct xfs_buf *bp); |
Christoph Hellwig | 4e23471 | 2010-01-13 22:17:56 +0000 | [diff] [blame] | 201 | |
| 202 | extern void xfsbdstrat(struct xfs_mount *, struct xfs_buf *); |
| 203 | extern int xfs_bdstrat_cb(struct xfs_buf *); |
| 204 | |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 205 | extern void xfs_buf_ioend(xfs_buf_t *, int); |
| 206 | extern void xfs_buf_ioerror(xfs_buf_t *, int); |
Christoph Hellwig | 901796a | 2011-10-10 16:52:49 +0000 | [diff] [blame] | 207 | extern void xfs_buf_ioerror_alert(struct xfs_buf *, const char *func); |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 208 | extern int xfs_buf_iorequest(xfs_buf_t *); |
| 209 | extern int xfs_buf_iowait(xfs_buf_t *); |
Dave Chinner | b9c4864 | 2010-01-20 10:47:39 +1100 | [diff] [blame] | 210 | extern void xfs_buf_iomove(xfs_buf_t *, size_t, size_t, void *, |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 211 | xfs_buf_rw_t); |
Christoph Hellwig | 1a1a3e9 | 2010-10-06 18:41:18 +0000 | [diff] [blame] | 212 | #define xfs_buf_zero(bp, off, len) \ |
| 213 | xfs_buf_iomove((bp), (off), (len), NULL, XBRW_ZERO) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 214 | |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 215 | static inline int xfs_buf_geterror(xfs_buf_t *bp) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 216 | { |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 217 | return bp ? bp->b_error : ENOMEM; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 218 | } |
| 219 | |
| 220 | /* Buffer Utility Routines */ |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 221 | extern xfs_caddr_t xfs_buf_offset(xfs_buf_t *, size_t); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 222 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 223 | /* Delayed Write Buffer Routines */ |
Christoph Hellwig | 61551f1 | 2011-08-23 08:28:06 +0000 | [diff] [blame] | 224 | extern void xfs_buf_delwri_queue(struct xfs_buf *); |
| 225 | extern void xfs_buf_delwri_dequeue(struct xfs_buf *); |
| 226 | extern void xfs_buf_delwri_promote(struct xfs_buf *); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 227 | |
| 228 | /* Buffer Daemon Setup Routines */ |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 229 | extern int xfs_buf_init(void); |
| 230 | extern void xfs_buf_terminate(void); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 231 | |
Christoph Hellwig | 1d5ae5d | 2011-07-08 14:36:32 +0200 | [diff] [blame] | 232 | #define XFS_BUF_ZEROFLAGS(bp) \ |
| 233 | ((bp)->b_flags &= ~(XBF_READ|XBF_WRITE|XBF_ASYNC|XBF_DELWRI| \ |
| 234 | XBF_SYNCIO|XBF_FUA|XBF_FLUSH)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 235 | |
Dave Chinner | 430cbeb | 2010-12-02 16:30:55 +1100 | [diff] [blame] | 236 | void xfs_buf_stale(struct xfs_buf *bp); |
Christoph Hellwig | 0cadda1 | 2010-01-19 09:56:44 +0000 | [diff] [blame] | 237 | #define XFS_BUF_UNSTALE(bp) ((bp)->b_flags &= ~XBF_STALE) |
| 238 | #define XFS_BUF_ISSTALE(bp) ((bp)->b_flags & XBF_STALE) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 239 | |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 240 | #define XFS_BUF_ISDELAYWRITE(bp) ((bp)->b_flags & XBF_DELWRI) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 241 | |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 242 | #define XFS_BUF_DONE(bp) ((bp)->b_flags |= XBF_DONE) |
| 243 | #define XFS_BUF_UNDONE(bp) ((bp)->b_flags &= ~XBF_DONE) |
| 244 | #define XFS_BUF_ISDONE(bp) ((bp)->b_flags & XBF_DONE) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 245 | |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 246 | #define XFS_BUF_ASYNC(bp) ((bp)->b_flags |= XBF_ASYNC) |
| 247 | #define XFS_BUF_UNASYNC(bp) ((bp)->b_flags &= ~XBF_ASYNC) |
| 248 | #define XFS_BUF_ISASYNC(bp) ((bp)->b_flags & XBF_ASYNC) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 249 | |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 250 | #define XFS_BUF_READ(bp) ((bp)->b_flags |= XBF_READ) |
| 251 | #define XFS_BUF_UNREAD(bp) ((bp)->b_flags &= ~XBF_READ) |
| 252 | #define XFS_BUF_ISREAD(bp) ((bp)->b_flags & XBF_READ) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 253 | |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 254 | #define XFS_BUF_WRITE(bp) ((bp)->b_flags |= XBF_WRITE) |
| 255 | #define XFS_BUF_UNWRITE(bp) ((bp)->b_flags &= ~XBF_WRITE) |
| 256 | #define XFS_BUF_ISWRITE(bp) ((bp)->b_flags & XBF_WRITE) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 257 | |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 258 | #define XFS_BUF_ADDR(bp) ((bp)->b_bn) |
| 259 | #define XFS_BUF_SET_ADDR(bp, bno) ((bp)->b_bn = (xfs_daddr_t)(bno)) |
| 260 | #define XFS_BUF_OFFSET(bp) ((bp)->b_file_offset) |
| 261 | #define XFS_BUF_SET_OFFSET(bp, off) ((bp)->b_file_offset = (off)) |
| 262 | #define XFS_BUF_COUNT(bp) ((bp)->b_count_desired) |
| 263 | #define XFS_BUF_SET_COUNT(bp, cnt) ((bp)->b_count_desired = (cnt)) |
| 264 | #define XFS_BUF_SIZE(bp) ((bp)->b_buffer_length) |
| 265 | #define XFS_BUF_SET_SIZE(bp, cnt) ((bp)->b_buffer_length = (cnt)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 266 | |
Christoph Hellwig | 38f2323 | 2011-10-10 16:52:45 +0000 | [diff] [blame] | 267 | static inline void xfs_buf_set_ref(struct xfs_buf *bp, int lru_ref) |
Dave Chinner | 821eb21 | 2010-12-02 16:31:13 +1100 | [diff] [blame] | 268 | { |
| 269 | atomic_set(&bp->b_lru_ref, lru_ref); |
| 270 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 271 | |
Chandra Seetharaman | 811e64c | 2011-07-22 23:40:27 +0000 | [diff] [blame] | 272 | static inline int xfs_buf_ispinned(struct xfs_buf *bp) |
| 273 | { |
| 274 | return atomic_read(&bp->b_pin_count); |
| 275 | } |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 276 | |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 277 | static inline void xfs_buf_relse(xfs_buf_t *bp) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 278 | { |
Christoph Hellwig | bfc6017 | 2011-01-07 13:02:23 +0000 | [diff] [blame] | 279 | xfs_buf_unlock(bp); |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 280 | xfs_buf_rele(bp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 281 | } |
| 282 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 283 | /* |
| 284 | * Handling of buftargs. |
| 285 | */ |
Dave Chinner | ebad861 | 2010-09-22 10:47:20 +1000 | [diff] [blame] | 286 | extern xfs_buftarg_t *xfs_alloc_buftarg(struct xfs_mount *, |
| 287 | struct block_device *, int, const char *); |
Christoph Hellwig | c141b29 | 2009-03-03 14:48:37 -0500 | [diff] [blame] | 288 | extern void xfs_free_buftarg(struct xfs_mount *, struct xfs_buftarg *); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 289 | extern void xfs_wait_buftarg(xfs_buftarg_t *); |
| 290 | extern int xfs_setsize_buftarg(xfs_buftarg_t *, unsigned int, unsigned int); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 291 | extern int xfs_flush_buftarg(xfs_buftarg_t *, int); |
Dave Chinner | d808f61 | 2010-02-02 10:13:42 +1100 | [diff] [blame] | 292 | |
Nathan Scott | ce8e922 | 2006-01-11 15:39:08 +1100 | [diff] [blame] | 293 | #define xfs_getsize_buftarg(buftarg) block_size((buftarg)->bt_bdev) |
| 294 | #define xfs_readonly_buftarg(buftarg) bdev_read_only((buftarg)->bt_bdev) |
| 295 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 296 | #endif /* __XFS_BUF_H__ */ |